Ed Bray
24-Aug-2012, 04:19
I have the chemicals required to make a batch of TF-3 Alkaline Fixer. It states that to maximise the stain when using Staining Developers (I will be using Pyrocat HD) to reduce or eliminate the amount of Sodium Sulphite.
It fursther states that this will reduce the keeping properties of the working solution, so, by this does it mean the 1:4 working strength solution or the working stock solution that has just been made up? Therefore, do small batches need to made up (stock/working stregnth) individually on the day of use or can I make the stock up without (or a reduced amount of) the Sodium Sulphite and just make up the working strength as required on the day?
Does anyone have a good ratio of Sodium Sulphite vs Stain/keeping qualities per 1000mls
If I decided to go down the no Sodium Sulfite road, could I just make up the working strength straight on the day, such as 400mls working strength (that would be all I need for either drum or orbital processing)?
400/5 = 80 ml of stock solution
in 1000mls of Stock Solution there is 480g of Ammonium Thiosulphate and 5g Sodium Metaborate, therefore to make up 80mls Stock (400mls working strength) would be:
480/1000*80 = 38.4g Ammonium Thiosulphate
5/1000*80 = 0.4g Sodium Metaborate
Made up in 60mls hot distilled water then topped up to 400mls to make a one shot/day working strength TF-3 Fixer
Would this work?
It fursther states that this will reduce the keeping properties of the working solution, so, by this does it mean the 1:4 working strength solution or the working stock solution that has just been made up? Therefore, do small batches need to made up (stock/working stregnth) individually on the day of use or can I make the stock up without (or a reduced amount of) the Sodium Sulphite and just make up the working strength as required on the day?
Does anyone have a good ratio of Sodium Sulphite vs Stain/keeping qualities per 1000mls
If I decided to go down the no Sodium Sulfite road, could I just make up the working strength straight on the day, such as 400mls working strength (that would be all I need for either drum or orbital processing)?
400/5 = 80 ml of stock solution
in 1000mls of Stock Solution there is 480g of Ammonium Thiosulphate and 5g Sodium Metaborate, therefore to make up 80mls Stock (400mls working strength) would be:
480/1000*80 = 38.4g Ammonium Thiosulphate
5/1000*80 = 0.4g Sodium Metaborate
Made up in 60mls hot distilled water then topped up to 400mls to make a one shot/day working strength TF-3 Fixer
Would this work?